WordNet records no synonym and no antonym for plastination. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
a process involving fixation and dehydration and forced impregnation and hardening of biological tissues; water and lipids are replaced by curable polymers (silicone or epoxy or polyester) that are subsequently hardened
“the plastination of specimens is valuable for research and teaching”
Synonyms, antonyms and the broader and narrower relations for plastination come from Princeton University’s WordNet. Full sources and licences.